Sling attachment device



FIG. 1 is a top left-front side isometric view of a sling attachment device showing my new design;

FIG. 2 is a bottom right-rear side isometric view thereof;

FIG. 3 is a left side elevation thereof;

FIG. 4 is a right side elevation thereof;

FIG. 5 is a rear elevation thereof;

FIG. 6 is a front elevation thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken line showing portions of the sling attachment device in FIGS. 1 and 7 forms no part of the claim. 

CLAIM The ornamental design for a sling attachment device, as shown and described. 